Disclosed is a compound anticancer slow release agent which comprises slow release microspheres and dissolvent, wherein the slow release microballoons comprise anti-cancer active constituents and slow release auxiliary materials, the dissolvent being specific dissolvent containing suspension adjuvant. The anticancer effective ingredients include Aclarubicin, Idarubicin, Doxorubicin, Epirubicin, Valtaxin, Pirarubicin, Losaxantrone, Losoxantrone and / or anticancer antibiotic synergistic agents selected from phosphoinositide-3-kinase inhibitor, pyrimidine analogues and / or DNA restoration enzyme inhibitor, the slow release auxiliary materials are selected from polylactic acid copolymer EVAc, or sebacic acid copolymer, the viscosity of the suspension adjuvant is 100-3000cp (at 20-30 deg C). The slow release microspheres can also be prepared into slow release implanting agent for lowering down the whole body toxicity reaction of the medicament when locally dispensing on the tumor, and for selectively increasing the tumor local medicinal concentration.